The Mooka Boys are at the end of their tether. Sam Mehan calls in some tech gurus to map out the treacherous parts of their underground mine with the help of “Spot” the robot dog. The Opal Whisperers return to Queensland to search for the ‘Yowah Nut’.

The Bushmen have grand plans to drill a new shaft to connect some old underground drives. Slim Pickings' entire operation is shut down when their 60-year-old tractor breaks down. The Cheals must head underground to reach their enormous $500k target.

The Mooka Boys make a discovery that could turn their fortunes around. The Cheals face constant machinery failures. After collapsing the decades old underground mine on their claim, The Opal Whisperers search for Yowah Nuts in the scorching heat.

Slim Pickings' Lee Hobden and Roger Williams look for clues to the whereabouts of buried treasure in the machinery discarded by the old-time miners. The Bushmen have decided to move to a promising new claim they've christened ‘Froggies’.